- Operating out of Singapore Changi Airport's (SIN) Terminal 1, KLM Airlines provides a smooth and cozy travel experience. A range of facilities, such as dining establishments, lounges, and duty-free shopping, are available at the KLM Airlines SIN Terminal to make sure travelers have all they need prior to flying. Travelers on KLM can anticipate a seamless experience from check-in to boarding thanks to the airline's convenient transportation options and friendly staff. Traveling through SIN Terminal with KLM is a fun experience, whether for business or pleasure.